Security Bulletin
Summary
IBM WebSphere eXtremes Scale's OQL is affected by remote code execution (CVE-2026-13772)
Vulnerability Details
CVEID: CVE-2026-13772
DESCRIPTION: WebSphere eXtreme Scale's Object Query Language engine resolves attacker-supplied class names via Class.forName() and invokes their
constructors with no allow-list at three distinct sinks (SELECT NEW, enum literals, and reflection-based comparators); an authenticated
remote attacker who can influence an application-built OQL query string can execute arbitrary constructors on the WAS JVM, and a
SELECT DISTINCT variant using planted grid values fires the same gadget post-readObject in a manner that survives JEP-290
serialization filters across grid node boundaries
CWE: CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CVSS Source: IBM
CVSS Base score: 7.5
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| WebSphere Extreme Scale | 8.6.1.0 - 8.6.1.6 |
Remediation/Fixes
If eXtreme Scale is being used as a Session Cache (Session Grid), this vulnerability is not applicable. In a Session Grid deployment, applications typically use eXtreme Scale only to store and retrieve HTTP session data and do not create or execute Object Query Language (OQL) queries against the session data. As a result, the vulnerable OQL functionality is not exercised.
If eXtreme Scale is being used as a Simple Grid and the application executes OQL queries, the risk can be mitigated through application code changes. Recommended mitigation strategies include:
1. Never concatenate user-supplied input directly into OQL statements. Use query parameters wherever possible.
2. Restrict dynamically specified class names to a predefined allow list of approved classes.
3. Do not allow end users to construct or modify OQL query syntax.
4. Avoid dynamically loading comparator classes or using reflection-based sorting based on user input.
5. Validate and sanitize all user-supplied values before they are used to construct OQL queries.
These mitigations help prevent untrusted input from influencing OQL execution and eliminate the attack paths associated with this vulnerability.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
30 Jun 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
30 June 2026
Initial Publish date:
30 June 2026
UID
ibm17278593